Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a7fe81586d64bf…

MALICIOUS

PDF

36.2 KB Created: 2020-03-29 06:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9eb5b7c88c097c40ce334dd964015ffb SHA-1: 295468592ce8f03a45859a4f506ed8ead4927241 SHA-256: 11a7fe81586d64bf3927d67eb66019c5916dce05e703f913d3bf82d8837a794a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs that point to a link farm, likely intended to redirect users to malicious content. The document body text, though partially obfuscated, contains phrases like 'Imprimir talon de cheque sep puebla' which suggests a lure for payment-related scams. The presence of a password archive lure heuristic indicates that the document may be part of a multi-stage attack designed to bypass security controls.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://blockchainambassador.ca/uploads/1/3/1/4/131406520/131406520.html#imprimir+talon+de+cheque+sep+puebla
    • http://aaronlstrong.com/uploads/1/3/0/6/130621952/02a354c702897b8.pdf
    • http://thepaperaide.com/uploads/1/3/0/5/130543262/4b03f7.pdf
    • http://alperulus.com/uploads/1/3/1/0/131069935/xazivapomapad_nusijide_dilepapefa.pdf
    • http://slatteneyecare.com/uploads/1/3/0/7/130739225/1429229.pdf
    • http://officialpetvet.com/uploads/1/3/0/3/130313183/lakaw.pdf
    • http://www.secret-rendezvous.com/uploads/1/3/0/2/130271073/fezuxojilotesixum.pdf
    • http://techstologie.com/uploads/1/3/0/9/130969358/c92061b.pdf
    • http://rsqrd.com/uploads/1/3/0/5/130551576/gizotupawejejemuj.pdf
    • http://chronicrunners.com/uploads/1/3/0/3/130313453/1247424.pdf
    • http://mgrouptyres.com.au/uploads/1/3/0/6/130639539/9389b0a4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062f5.bin
1f38461ee58ab6687d120185adaeb948fbd0da3b7286027b14cc14dcd26d4282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F5 8568 bytes

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